I think this is a really neat idea. I actually know one artist (diplo I think) has started a second SC account just for retweeting stuff he recommends. I have a couple of accounts and am quite particular about the music I favourite (has to be stuff that my followers would also like e.g. No rock music on my EDM account and vice versa). I'm not sure everyone is like this though so it might be difficult to find accounts of artists who favourite music their fans would also like. It leaves an opportunity for you to do some sort of curation of artists with a good history of favouriting.

Edit:

Is the site open source?